Transmission illumination device in a picture scanning device

Details Transmission illumination device in a picture scanning device Transmission illumination device in a picture scanning device

1983-09-06

1985-12-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358206, H01J 314

Patent

active

045582149

ABSTRACT:
Disclosed is an improved transmission illumination device for use in a picture scanning device such as an electronic picture scanner which can illuminate an annular region around an illuminated spot. This annular illuminated spot is produced by using an annular convex lens as part of an optical system. Since the area surrounding the illuminated spot is also illuminated, finding a desired spot on an original picture is greatly facilitated. Having an illuminated annular region does not create any problem which may arise from flare light if an iris diaphragm is provided in a light receiving head for the exclusion of the light emitted from the illuminated annular area.

REFERENCES:
patent: 3170367 (1965-02-01), Wick
patent: 3635135 (1972-01-01), Ambraschka et al.

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